Funny learning swimming ring for adults children Materials are environmentally friendly non-toxic thickened PVC material. Can quickly help those who want to learn to swim as soon as possible Size S is suitable for kids 90-135cm. Size M is for kids 135-155cm. Size L is for adult 155-175cm. Size XL is for adult 175-180cm The needs of swimming are fully taken into the design, so you can freely move forward, back, left and right to swim in different direcions.